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Dear all,
I've been hacking on histograms the past couple of days. I wanted to do
two things, add histograms where the breaks of one histogram is a
subset sequence of the other, and get a histogram plot from a histogram
object. I found no function to do these things and got no response on
r-help, so I started doing it myself. I think I have solved it now, so
I have attached the code I've got, in case it would be something to
include in R in the future.
I guess most of the file is your code, that is, it's just hist.default
with only two changes:
In the line
stop("`probability' is an alias for `!freq', however they differ.")
--------------------^ closing ' was missing
and it returns an object with class="histogram".
Then, I made hist.histogram, that plots an existing "histogram" object.
This is also just your code, I just did cut'n'paste on the parts that
seemed relevant. One might argue that the default method should be split
in two, since these two parts are almost identical.
Then, there's adding. To find a subset sequence, I wrote a
sub.vector-function, admittedly very ugly, what I really wanted was a
function that would output the union of sequences and pad the rest with
zeros. Anyway, the function solves my problem... (I'm not usually a
pragmatist... :-)) Then, there's the add.histogram function that outputs a
histogram object. I tried to declare "+".histogram, "%+%".histogram and
things like that, in the hope of creating a binary operator for
histograms, but I couldn't get it to work. Anyway, this is what I've got,
I hope it can be used.
Best,
Kjetil
--
Kjetil Kjernsmo
Graduate astronomy-student Problems worthy of attack
University of Oslo, Norway Prove their worth by hitting back
E-mail: kjetikj@astro.uio.no - Piet Hein
Homepage <URL:http://www.astro.uio.no/~kjetikj/>
Webmaster@skepsis.no
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